The correctly balanced equation among the options is 2HgO → 2Hg + O2.
Balancing a chemical equation means ensuring that the number of atoms of each element on both sides of the equation are the same in accordance to the law of conservation of mass.
To balance a chemical equation, we make use of coefficients, which are numbers placed in front of the element or compound in the reaction.
According to this question, the following equation: 2HgO → 2Hg + O2, is correctly balanced because the number of atoms of Hg (2) and O (2) are the same on both sides.
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